Projection apparatus



A. BONI ET AL PROJECTION APPARATUS Oct. 28, 1941.

Filed oct. 28, 1939 2 Sheets-Sheet l nun:

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0 a y #0 m K Z IN\I/ENTO R. fllberf 3022 L Patented Oct. 1941 PROJECTION APPARATUS Albert Bon! and George Goldberg, New York,

N. Y.', alsignors to Reade: Microprint Corporation, New York, N. Y., a corporation of Delaware Application October 28, 1939, Serial N 301,687 8 Claims. (or. 88-24) This invention relates to a novel and improved form of projection apparatus, the novel features of which will be best understood from the following description and the annexed drawings, in which we have shown a selected embodiment of the invention and in which:

Fig. 1 is a front view of an apparatus asit appears to the user;

Fig. 2 is a vertical sectional view through the lower portion'of the apparatus shown in Fig. 1, this view'being taken on the line 2-2 of Fig. 4;

Fig. 3 is a view taken on the line 3-3 of Fig. 4;.

Fig. 4 is a plan view of the lower part of the apparatus shown in Figs. 2 and 3.

In each one of the figures certain parts have been omitted for the sake of cleamess of illustration of other parts.

The invention finds particular utility in connection with the opaque projection of microprints. In Fig. 4, I have shown a sheet I having thereon microprints 2 of a large number of pages from a book. For example, it may be assumed that there are 100 pages thus reproduced and that these pages are arranged in columns extending perpendicular to each other, ten pages in a column. For the sake of convenience, Ishall refer to the columns extending vertically in Fig. 4 as the vertical columns and those extending horizontally'in that figure as the horizontal columns. By means to be described presently, the 39 the columns of pages.

sheet may be moved horizontally and vertically, as viewed in Fig. 4, so that any microprint of a page 2 may be brought into position to be read. For the sake of convenience hereinafter, the microprints 2 will be referred to as pages.

The pages may be exposed at a projection position exemplified by an aperture 3 ma plate 4, where they may be illuminated and projected by means to be described later. Th sheet I is shown as being supported on a plate 8 which is urged by springs 6 upwardly against the flanges of a holder 7. This holder is slidably supported in tracks 8 of a carriage 9, which in turn is slidably supported on tracks on a suitable support, here shown as a drawer ll slidable into and out of a casing I2 of which the plate 4 forms the top.

Rotatably supported in side walls of the drawer or support is an elongated pinion I3 engaging racks H on the bottom of the holder. Because of the elongated construction of the pinion, the

by means of racks l4 engaged by pinions 15 on a shaft I 6 which also is rotatably mounted in the support formed by the drawer H. The shaft l6 may extend through the front wall of the drawer, as plainly shown in Figs. 2 and 3, and may be provided with a handle ll for rotating it. The pinion l3 may be rotated by another handle I8 on a shaft l9 which extends through the front wall of the drawer and which may be rotatably supported on the drawer by any suitable means. This shaft is shown as having on. its end a bevel pinion 20 engaging with another bevel pinion 2| secured to a gear 22 which engages the pinion l3 adjacent one end thereof.

By the arrangement described above, it will be seen that the turning of the handle I8 will bring the desired horizontal column beneath the aperture 3, and then turning of the handle ll will cause the desired vertical column to register with the aperture, thus bringing the desired page into such registry. As an aid for positioning the correct page beneath the aperture, Imay provide indicators, here shown as disks 23 and 24 mounted upon stub shafts and rotated from the shafts l6 and I9, respectively, by means of chain drives 25 and 26. Each disk has numbers thereon which may be seen through holes 21 in the front wall of the drawer and it will be understood that these numbers will correspond to the numbers of Since the pages are as sumed to be arranged 100 on a sheet, ordinarily the two numbers appearing at the holes 21 will indicate the number of the page at the aperture.

Extending over the aperture 3 is a spherical hood 28, on the inner surface 29 of which is a spherical reflector, and the center of this surface 23 is approximately at the center of the aperture 3. Directly above the aperture is shown an objective 30 which of course extends throughan,

0 opening in the hood, and the axis of this objecholder may slide lengthwise of the pinion, but

may be operated by rotation of the pinion, no matter what may be its position lengthwise of the pinion.

The carriage may be moved on the tracks I0 tive passes through the center of the aperture.

The hood and the reflecting surface are provided with a plurality of other openings 3|, here shown as three in number. Each one of these openings is provided with illuminating means, although, in order to avoid confusion in the drawing and obscuring of other features, we have shown only one such illuminating means, this appearing in Fig. 2. I

This illuminating means is disposed on the outside of the hood and comprises a lamp 32, on the back of which is an elliptical reflector 33. The filament of the lamp is disposed substantially at one focus of the ellipse of which the reflector forms a part, and the other focus is adjacent the aperture 3, preferably htly above it. Between the lamp and the hood a spherical reflector 34 so that all light which does not pass through the opening 3| will be reflected back and caught by the elliptical reflecting surface 33 and thus directed through the hole 3 I.

; The axis 35 passing from each lamp 32 through each opening 3i to aperture 3 is on a;

radius of the spherical hood and it will be seen that each of the openings 3| and consequently its associated illuminating device is on one side of the objective 30, and the portion of the hood:

on the side of the objective opposite each opening 3| is unbroken. This means that the light directed from each illuminating device to the aperture and which may be reflected from the sheet exposed at that aperture will pass along some such line as that shown at 36 in Fig. 2 and will strike a portion of the reflecting surface 29.;

also through any one of the openings 3| or lamp associated therewith will also pass through a reflecting surface of the reflector on the side of the objective opposite that lamp.

Preferably also it will be seen that one of thef openings 3| is in a plane which passes through the axis of the objective and also through one:

of the vertical columns of pages. This opening -and its associated illuminating device is shown in Fig. 2. Preferably it isdirected towards the page from the bottom thereof.

By the above arrangement it has been found that the illumination of the page is much more eflicient than with other arrangements previously tried." The page is illuminated substantially uniformly by the three lamps arranged as shown, although the lamp shown specifically in is not necessary to an understanding of the inventions claimed herein and therefore it has not been shown. Such arrangements of course are well known in the art.

It will be seen that the projection position is flxed and that the objective and screen are also flxed with relation to the projection position, although of course minor adjustments may be made for focusing or centering the image of the object on the screen. ..Such' adjusting means have not been shown, as they are common in the art and ordinarily, as shown here, it is feas- 1 ible to construct an apparatus such that the image is properly centered on the screen at all times and the only adjustment necessary would be the ordinary focusing adjustment of the objective. By operating thecarriage and slider as noted above, any selected object, such as a microprint \of any particuiar page, may be brought to the projection position without disturbing the position of the objective or without disturbing the relation of the screen, objective. and projection position. Therefore each object, as it is brought to the'projection position, will be imaged on the same part of the screen as every other object. In other words, each object will be properly centered on located on. the

screen, and, as described above, by observing the indicator any selected object may be projected readily on the screen. I

Our device is adapted to project microfilm as well as microprints by merely placing the fllm on a white surface so that light rays will be reflected therethrough. Thedevice may also be used in the examination of specimens of material such as fabric, paper, liquids or the like.

The apparatus is likewise applicable for a projector using transmitted light as well as reflected light. Where the claims specify microprints, it is intended to include microfllm and any other object which can be conveniently examined with the aid of our device.

We claim: v

1. A projection apparatus comprising a casing having an aperture therethrough, a support siidable in a horizontal plane in and out of said casing for the object whose image is to be projected, tracks on said support extending transversely of said object, a carriage siidable on said tracks, tracks on said carriage extending transversely of the tracks on said support, a holder slidably mounted on said carriage tracks, an elongated pinion rotatable on said support, a rack on said holder and engaging said pinion, said rack extending in the direction of movement of saidholder; a second rack on said carriage and extending in the direction of movement of said carriage on the support, a pinion rotatable on the support and engaging said lastnamed rack, and means to rotate said pinions independently of each other, wherebyupon rotation of said last-named pinion said first-named rack will slide along said first-named pinion.

2. A projection apparatus having a casing with an aperture in the top thereof, means slidable in and out of said casing in a horizontal plane for supporting a sheet under said aperH ture, an inverted spherical reflector having its center adjacent said aperture, an objective extending through said reflector and having its axes passing through said aperture, a' plurality of lamps supported outside of said reflector, means to direct light from said lamps through holes in said reflector onto the part of the sheet exposed under said aperture, each lamp being disposed on one side of said objective and opposite a reflecting surface of said reflector on the opposite side of said objective, said sheet having thereon a plurality of prints of pages arranged in columns, and one of said lamps being disposed in a plane passing through said objective and the center line of one "of said columns.

3. A projection apparatus comprising a casing having an aperture through the top thereof, a

screen supported above said casing. a sheet having thereon a plurality of microprints arranged porting said sheet in place for one of said microprints to be exposed under said aperture, means for permitting said holder to be moved in and out of said casing in a horizontal plane, means to illuminate a microprint when it is positioned under said aperture, means to project an image of said microprint on said screen, and means to move said holder in two directions parallel to said vertical and horizontal columns to bring any one of said microprints underneath said aperture when said holder is within said casing.

4. A projection apparatus comprising a casing having an aperture inthe top thereof, a screen supported above said casing, a sheet having thereon a plurality of microprints arranged in vertical and horizontal columns, a holder slidable' in and out of said casing for supporting said sheet in place for one of said microprints to be exposed underneath said aperture, means to illuminate a microprint when so exposed under said aperture, means to project an image of said microp'rint onto said screen, means to move said holder in two directionsp'arallel to said vertical and horizontal columns to bring any one of said microprints under said aperture, said microprints being numbered, and an indicator opholder in a direction parallel to said rows and parallel to said columns, and indicating means for indicating the number-of any, row and any column under said aperture and so arranged 1 that the combination of digits indicates the number 01' any microprint.

7. In a projection apparatus, a casing with an aperture therethrough, an objective and a screen arranged in relation to said aperture so that light rays passing through said aperture will be projected on said screen, an object holder under said .aperture adapted to receive a sheet of 'microprints arranged in ten rows and ten columns,

means for moving said holder in relation to said aperture in a direction parallel to the columns of microprints, means for moving said holder in relation to said aperture in a direction parallel to the rows of microprints, indicating means includerated by said last-named means showing which of the multiple microprints on the sheet is ex-' posed at said projection position.

5. In a projection apparatus, a casing with an aperture therethrough, an objective and a screen arranged in relation to said aperture so that light rays passing through said aperture will be pro-;

jected on said screen, an object holder under said aperture adapted to receive a sheet of microprints arranged in ten rows and ten columns, means for moving said holder in relation to said aperture in a direction parallel to the columns of microprints and in, a direction parallel to the rows of microprints, indicating means connected to the means for moving said holder to indicate the number of each row, and indicating means to indicate the number of each column, said indicating means arranged in juxtaposition so that the combination oi the digits viewed thereon designates the number of the microprint under said aperture.

6. In a projection apparatus, a casing with an aperture therethrough, means for ill ting said aperture, an objective above said aperture and a screen positioned in relation to said objective so that an object under said aperture will be projected on said screen, an object holder comprising a flat plate designed to receive a sheet oi microprints arranged in a rectangle of ten columns and ten rows, means for moving said a digit from the other will serve to iorma number designating the number of microprint under said aperture from zero to 99, inclusive.

8. In a projection apparatus, a casing with an aperture therethrough, an objective and a screen arranged in relation to said aperture so that light rays passing through said aperture will be projected on said screen, an object holder under said aperture adapted to receive a sheet or microprints arranged in ten rows and ten columns, means for moving said holder in relation to said aperture ina direction parallel to the columns of microprints, means for moving said holder in relation to said aperture in a direction parallel to the rows of said microprints, indicating means including a dial having ten digits thereon connected to said first-mentioned means, indicating means including a dial having digits thereon connected to said second-mentioned means,saiddialsbeinginsuch relationtoesch other that a combination or a digit from one andadigitrromtheotherwillservetoiorma number designating the number of the microprint under said aperture.

ALBERT BON'L GEORGE 

